We have bought a new server where so far i have migrated the data and joined the new server (2008 R2) as an additional DC but still the operational master is Server 2008 Standard Edition. Now with the help of adprep /forestprep i was able to join the new server successfully and currently want to demote the old one by CAREFULLY transferring all the roles required without screwing up anything. I want AD and GP work as usual without any downtimes. I forgot the powershell commands or if there is a GUI way to do it. It would be great. I know the way but i don't want to take any kind of risk because i can't recreate the domain for 60 computers again. Thank you.